Level up hangs the game

[Coach]

Hi, I just come to Lvl5. The picture appeared about L5, and there was no X to click to get the rid of picture:

[Angelly]

There should be "x" button, but only outside you window. As workaround for now, try to use ctrl + "+" or ctrl + "-" or use mouse wheel to zoom in or zoom out window. To get back to normal size of window, press ctrl + 0. This will help you in the time, when devs will fox this problem.
A.